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found: Wikipedia, June 19, 2013(Edna Ernestine Kramer Lassar (May 11, 1902 - July 9, 1984), born Edna Ernestine Kramer, was an U.S. mathematician and author of mathematics books. Kramer was born in Manhattan. She finished her B.A. in mathematics at Hunter College in 1922 summa cum laude. While teaching at local high schools, she made M.A. in 1925 and Ph.D. in 1930 in mathematics (with a minor in physics) at Columbia University. She married the French teacher Benedict Taxier Lassar on July 2, 1935. Kramer died at the age of 82 in Manhattan of Parkinson's disease.)